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How to fix iOS11.2.6/11.3/11.3.1 Battery drain issue on iPhone X/8/7/6

Many
iPhone users after upgrading to iOS11.2.6/iOS11.2.5 and the latest iOS 11.3.2 are facing serious
battery drain issues. iPhone users are experiencing fast battery discharge and
mobile heating up once they upgraded to latest iOS software release. Even
resetting the device does not seem to help for the issue. For many users it is
like the battery drain 80% in 6hours normal usage. This was never the case with
older iOS releases. Even new iPhone X and iPhone 8/7 users a facing battery
drain issue in iOS11.2.6/ iOS11.3.1 and battery performing very poor.

It seems that
iOS11.2.6 has been causing problems for many usersand overheating and battery drain is one of
them. The issue is not widespread but significant users are affected by this.
Apple have not released any comments on battery drain in latest release. Even the iPhone 6 battery life iOS 11.2.6 has become worst performing as iPhone 6/6s are already reported with poor battery life issue with iOS11.

How
to fix battery drain issue in iOS11.2.5/iOs11.3.1

First
thing to do is check which thing is causing this much battery drain of iPhone.
GO to Settings->Battery and check the list for highest usage app or
services. If any obsolete or unused app is causing battery drain please
uninstall that immediately.

Fix 1: Turn
Off “Hey Siri”

While
your data is ON, Siri does consumes data for “Hey Siri feature” and it is
reported that Siri sometimes causes battery drain in iOS11. So please try by
turning off this feature : Goto->Settings > Siri & Search and
disabling Listen for Hey Siri.

Fix 2: Reduce
visual effects:

disable
the “parallax” effect in your iPhone which support 3D animation of wallpaper,
iMessage from auto playing.

Fix 3:
Turn off location services:

Head
to Settings > Privacy > Location. You should turn this off if not using regularly
or if you know which app is taking too much battery you can at least to try
that off.

Fix 4: Turn
off Bluetooth and WIFI:

You
must be aware that turning off Bluetooth and WIFI from control does not completely
turn these features off. In order to avoid battery drain please turn them off
by going inside Settings menu.